Prosody before 0.11.9 allows Uncontrolled CPU Consumption via a flood of SSL/TLS renegotiation requests.
Priority LOW 37Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
Prosody before 0.11.9 allows Uncontrolled CPU Consumption via a flood of SSL/TLS renegotiation requests.
Why it matters now
EPSS 0.02261 83rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:prosody:prosody:*:*:*:*:*:*:*:* | before 0.11.9 | Vulnerable | Prosody |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
- cpe:2.3:a:prosody:prosody:*:*:*:*:*:*:*:* Versions before 0.11.9 Vulnerable ·Prosody
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-32920
- 2026-10-03 Alias added: GHSA-7jvv-jg88-r4h8
References
Advisory 8
- https://blog.prosody.im/prosody-0.11.9-released/
- [oss-security] 20210513 Prosody XMPP server advisory 2021-05-12 (multiple vulnerabilities)
- [oss-security] 20210514 Re: Prosody XMPP server advisory 2021-05-12 (multiple vulnerabilities)
- DSA-4916
- FEDORA-2021-b5d8c6d086
- FEDORA-2021-a33f6e36e1
- FEDORA-2021-498be8f560
- https://security.gentoo.org/glsa/202105-15
Sources
- CVE-2021-32920 · CVE Program
- CVE-2021-32920 · NVD
- FIRST EPSS
- GHSA-7jvv-jg88-r4h8 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-32920 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences